A neck hump appears as a rounded, visible bump at the base of the neck, right where the neck meets the upper back. It sits at or just below shoulder level and is most noticeable when viewed from the side. Depending on the cause, it can range from a small, subtle mound to a pronounced bulge that changes the entire profile of the upper body.
Where It Forms on the Body
The bump develops at the cervicothoracic junction, the point where the seventh cervical vertebra (C7) meets the first thoracic vertebra (T1). This is roughly level with the tops of your shoulders. You can feel this spot yourself: the most prominent bony knob at the base of your neck when you tilt your head forward is the C7 vertebra, sometimes called the vertebra prominens. A neck hump builds outward from this area, either from excess tissue, changes in the spine’s curvature, or both.
Fat Pad vs. Bony Hump
Not all neck humps look or feel the same, and the difference usually comes down to whether the bump is made of fat or bone.
A fat-based hump, often called a buffalo hump, looks like a soft, rounded mound of tissue sitting on the back of the neck. The skin over it typically moves freely, and when you press on it, it feels squishy and pliable, similar to other fatty tissue on the body. It tends to have a smooth, dome-like shape and can grow gradually over weeks or months.
A bony hump, sometimes called a dowager’s hump, looks different. It appears more angular and fixed, created by the spine itself curving forward excessively (a condition called kyphosis). The bump feels hard and immovable when touched because it’s the vertebrae themselves pushing outward. The skin over a bony hump often looks stretched or thin, and the bump doesn’t shift when you press on it. In many cases, people develop a combination of both: the spinal curvature creates a structural bump, and fat tissue accumulates on top of it.
What It Looks Like From the Side
The clearest way to spot a neck hump is in a side profile view. In a person with good posture, the ear sits roughly above the center of the shoulder. When a neck hump is developing, the head drifts forward of that line, and the upper back rounds outward to compensate. This creates a visible “C” shape between the back of the head and the mid-back, with the hump at the apex of that curve.
In more advanced cases, the hump becomes obvious even from behind. It appears as a rounded mass between the shoulder blades, sometimes making the neck look shorter or thicker. Clothing may fit differently around the collar, and necklaces or shirt collars may ride up or sit unevenly. Some people first notice the hump because they can feel it pressing against the back of a chair or headrest.
Early Signs Before the Hump Is Obvious
A neck hump rarely appears overnight. Early on, the signs are subtle. You might notice a slight fullness or puffiness at the base of the neck that wasn’t there before. Horizontal skin creases may deepen across the back of the neck as posture shifts. Your head may sit noticeably further forward than it used to, something you can check with a simple test: stand with your back flat against a wall. If you can’t touch the back of your head to the wall without straining or tilting your chin upward, you likely have some degree of forward head posture, which often accompanies early hump development.
Another early clue is stiffness or achiness at the base of the neck, particularly after sitting for long periods. The muscles in that area are working harder to support a head that’s drifting forward, and the tissue changes follow.
What Causes the Different Types
A bony hump is most often caused by postural changes. Years of forward head posture, whether from desk work, phone use, or aging-related bone loss (especially in postmenopausal women), gradually increase the curve of the upper spine. Osteoporosis can accelerate this by causing small compression fractures in the thoracic vertebrae, which wedge forward and lock the spine into a curved position.
A fat-based hump has different origins. The most common cause is excess cortisol in the body, a hallmark of Cushing syndrome. This can happen when the adrenal glands overproduce cortisol or, more commonly, from long-term use of corticosteroid medications prescribed for conditions like asthma or autoimmune diseases. If cortisol is the cause, you’ll usually see other signs alongside the hump: weight gain concentrated in the face and abdomen, purple stretch marks on the belly, high blood pressure, slow wound healing, and elevated blood sugar.
Other causes of a fat-based hump include HIV medications (antiretroviral therapy), which can redistribute fat tissue in the body, and rarer genetic conditions that affect how fat is distributed. Central obesity, where fat accumulates around the midsection, face, and back of the neck, can also produce the appearance of a hump without any hormonal imbalance.
How to Tell Which Type You Have
Touch is the simplest first clue. Press gently on the bump. If it’s soft and you can move the tissue around, it’s likely fat-based. If it’s hard and feels like bone, the spine’s curvature is probably the primary cause. Look at the rest of your body for context, too. A fat-based hump from cortisol excess almost always comes with other visible changes: a rounder face, thinner skin that bruises easily, and abdominal weight gain. A postural hump tends to appear alongside rounded shoulders, a forward-jutting chin, and tightness in the chest and front of the shoulders.
Size matters as well. Fat-based humps can grow quite large and round, sometimes the size of a fist or larger. Postural humps tend to be flatter and wider, following the line of the spine rather than forming a distinct mound. If you’re unsure, imaging like an X-ray can show whether the vertebrae are involved and whether the curvature has progressed beyond what posture correction alone can address.